Lincoln Impinger Conveyor Ovens 1454 - Manual (Page 10)

Impinger I -–Adv Digital – Electric Service Manual - International 10
THERMOSTAT, OVEN CAVITY HI-LIMIT – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control box cover and front panel. Remove conveyor assembly and fingers from oven to aid in removal of
thermostat from oven.
3. Disconnect wires from thermostat and mark for reassembly.
4. Remove thermostat from oven.
5. Reassemble in reverse order and check system operation.
AIR PRESSURE SWITCH – REPLACEMENT
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Disconnect wires from air pressure switch and mark for reassembly.
4. Remove air switch tube from air pressure switch.
5. NOTE: There are two types of air pressure switches used. Remove air pressure switch from its mount.
6. Reassemble in reverse order and check system operation.
7. To adjust air pressure switch, remove cover from switch to expose adjusting screw. To increase sensitivity, turn
screw counter-clockwise. To decrease sensitivity, turn screw clockwise.
THERMOCOUPLE (TYPE K) - REPLACEMENT
1. Shut off power at main breaker.
2. Remove control panel top and front cover.
3. Slide thermocouple out of oven chamber.
NOTE: Remove conveyor and bottom fingers to aid in removal and installation of thermocouple.
4. Remove two (2) wires from temperature control. Make note of wire numbers or color and
location for reinstallation.
5. Reassemble in reverse order making sure the metal end on the thermocouple is in the wire form in the oven
chamber.
THERMOCOUPLE MEASURMENT
TEMPERATURE D.C. MILLVOLTS (APPROX.)
200
° 2.8
250
° 4.0
300
° 5.1
350
° 6.0
400
° 7.1
450
° 8.2
500
° 9.3
550
° 10.4
600
° 11.5